Special named constants

Special self-evaluating literal used in lambda parameter lists
before optional parameters.

Constant: #!rest

Special self-evaluating literal used in lambda parameter lists
before the rest parameter.

Constant: #!key

Special self-evaluating literal used in lambda parameter lists
before keyword parameters.

Constant: #!eof

The end-of-file object.

Note that if the Scheme reader sees this literal at top-level,
it is returned literally. This is indistinguishable from
coming to the end of the input file. If you do not want to end reading,
but want the actual value of #!eof, you should quote it.

Constant: #!void

The void value. Same as (values).
If this is the value of an expression in a read-eval-print loop,
nothing is printed.

Constant: #!null

The Java null value. This is not really a Scheme value,
but is useful when interfacing to low-level Java code.